Self-lowering high-speed lifting jack



r. L. GonMLEY.

SELF LOWERING HIGH SPEED LIFTING JACK.

APPucATlon msn o'cr. 2s. |921. l

F. L. GURMLEY.

.SELF LOWERJNG HIGH SPEED LIFTING JACK.

APFLlcATloN FILED ocT. 26. 192\|.

1,437,752. Patented Dee. 5,1922, 2 sHEETs-sum 2.

ji Z5 5.3

63 61 V a @a y N i ff s /f 'l' Lf/ 'II/2 I )591i Inventor:

40 Z5 l'raz/L.Gormle y,

1. MMM y i@ Patented Dec. 5, 1922.

unire FRANK L.y eonivrLnv, or yBaoentrain; essie-non ro A. o. Neuron,"

INC., or BosToN, MASSACHUSETTS, A oonronnron or MAINE.y

snnrmownernrf Breit-SPEED Lireiney JACK.

minimum sied october. ne, `1921. sel-isi rre." 516,537.

To @EZ i0 kom it "mcy'concerii se it immane@ i, Fiumi yn seraient citizen of theUnitedStates of intel-ica, andv` a resident of Brookline,.in theI4 county iof *Norfolk andiState of lllassacliusetts; have invented certain new n l useful; inprovef* ments in'SelteLowering -Speed Lifting Jacks of which thel following is f a "specificatiopfl 1 ingl jacks and islanfiinproveinent on `the iin? ent No. l 11,329,665? issuedA- Feb.` 8,' C. Kopf and F. H. Sohwerinff' w y y itlis alsoan improvement upon the invention shown and described vin U. Si "Patent No. 1,288,210issu`ed 29, 1917, tol.' EL ltlindinan.vv n o o The' main object of the'present invention" is to provide jacks;constructed vsiinilar to either Aof the jacks" shown in the patents above referred to,`with Inca-ns whereby the speed' ofthe ack when lowering'under its,

load,4 may befcont'rolled instead oitlneces sitating the `use of a eranktolower theload.

By means oii'thel improvementstherein shown and"described,` the jacks oi thepatf y entees will becomeselfdowering jacks."

Thek invention' consists" 'in ceitaiirnovel features of construction and arrangementot parts which will be understood readily by reference to the descriptionv of the dre-wings and to the claims to be hereinafter given. y

For the purpose of illustratingthe inven-y tion,y one preferred forin thereof is' illus-y trated in the drawings, 'this form having;

been Jfound to give satisfactory and reliable' v i therefor and above this ybearlngrsaid shttk results althougrh'it is to understood'fthat the various instrumentalities of' which thel invention consists can be variously arranged' and organized and the inventionis notflinnty Figure l representsa horizontal section` on line 4;, ll', on Fig; 2.

This 'invention trelatefsf tohigh speed 'littf fniounted inthe base 10.

- Similar` characters indicate like "parts" throughou'tl the several 'ligures "oi the'fdraw-J` ings.

In j ack havingthe upwardly 'exten'dingV cylin'f dricalstandard 1.1v providedjwith bearing` `surfaces12 for the cy'lind'ricalraniv 13 adapt `ed to be inoved vertically relatively' to said standard ll.v *y i Y' Q j The upper end ofthe 'rani 13 hassecured thereto ahead llandin the lowerend of said ram is fXedly secured a` nutll.

the drawings, y10 is the base of a liitino` i Extending through the nut 15 -rota- A ltable'screw 16 thread. y o

The lower end havingr a steep pitch helical of the screw 16 'has securedy thereto y a plate 17 resting on antiiirictionf' members v18 supported by a iixed 'plate 19 Above the plate 17 and keyed tojthe'kscrew 16 is a gear 2O which meshes with .a pinion '21 keyedto the shaft 22 parallel with the" screw land havingits opposite ends mounted in bearings 23"and 24 within an`r annex y section 25 secured to 'one side ofthe casing 10, 11, bv bolts 26',

f The shaft A22y has also keyed or,` other-- i 'wise secured thereto, a bevel gears 2'2" mesh-,

,ing with a bevel pinion 28 rotatable with4 the lifting; sha-tt y29 extending laterallyfroin the annex sectionf25. l A y, Y

Thisliftinglv shaft29 has a bearing inthe" gland 30 and its outer end is flat-sided, as.'y

at 3l, to receive the usual operatinglniechanism which may be of any well-known construction;

Midway of the shaft 22 is a bearing 32 substantiallyy identical with that fshownjand described in the before-mentioned"Patent No; 1,329,665; l pinion 3 pinion preferably being vformed integral with a worin gear` 39, the `teethi'of' whih rnesh with theworniO secured to 'one end ,100 suitable 8 meshes with the'geir this l' of and revoluble with the shaft 41 mounted in bearings 42 and 43 formed in the annex section 25.

The opposite end of the shaft 41 has secured thereto a gear 44. meshing with a pinion 45 mounted on a short shaft 46 freely revoluble in a bearing 47 and having secured to its opposite end a gear 48.

The teeth of the gear 48 mesh lwith those on a ge'ar 49 on the shaft 50 of the brake wheel 51.

Pivoted at l52, 52 are curved brake arms 53 which partially surround the brake wheel 5l. l i

Normally these brake arms 53 are in ysufficient frictional contact with the brake Wheel 51 as to prevent the rotation of said brake wheel 51.

The opposite ends of the brake arms are forced toward each other by springs 54 interposed between the outer faces of said arms 53 and ears on the annexsection 25.

interposed between the free ends of said arms .is a pivoted cam block 56 having flattened sides, this block being normally in the position indicated in Fig. 1 of the drawings.

The cam block 56 has secured to its shank, an operating handle 57, by manipulatinoV which the arms 53 may be separated from the brake wheel 51 to permit the free rotation of said brake wheel.

When it is desired to lift a load upon the head 14, an operating device is placed upon the part 31 of the operating shaft 29 and by means of the rotation of the bevel gears 28, 27 and spur gears 21, 20, the lifting screw 16 is rotated clockwise and in its rota.- tion acts upon the nut 15 to elevate the ram r13.

rlhis rotation of the shaft 22 in the direction of the arrow on Fig. 4, causes the pawls 36 to ride over the teeth of the ratchet without imparting any movement to the gear 34 and the pinion 38, worm gear 39, worml 40, gear 44, pinions 45, 48, 49 and brake wheel 51, the brake arms 53 at this time being in frictional contact with said wheel 5l and retaining all of these elements at rest.

Vhen the load has been lifted, the operating mechanism may be removed from the shaft 29 if desired and the friction of the arms 53 on the wheel 51 will be suiiicient to retain the load in elevated position due to the ratio of the various gears between the one-way clutch mechanism 33, 36 and said brake disk 51.

`When it is desired to lower the load the operator may release the brake arms 53 from the wheel 51 to a greater or lesser extent as desired, by manipulating the operating handle 57 and turning the cam member 56 about its aXis.

`When the brake arms 53 are thus released Vfrom the wheel 51 the load upon the head 14 will cause the ram 13 to vmove downwardly and this downwardly movement will cause the screw 16 to rotate contra-clockwise and the rotary movement will be transmitted through gear 20 and pinion 21 to the shaft 22 which will be rotated in a reverse direction, i. e., in a direction opposite to that indicated by the arrow on F ig. 4.

This reverse rotation of the shaft 22 will cause the teeth of ratchet wheel 33 to engage the pawls 36 and impart rotary movement to gear 34, pinion 38, worm gear 39, worm 40, gear 44, pinions 45, 48, 49 and brake wheel 51.

Owing to the reduction in gearing the brake wheel 51 will be rotated at considerable speed if the brake arms 53 are wholly removed from contact therewith but if the brake arms are retained in frictional contact with said wheel the speed of lowering may be easily regulated even under the heaviest load by simply increasing or decreasing the frictional contact between the arms and wheel as desired.

The pinion 38 is provided with a centrally disposed cylindrical boss 60 having a bearing in the annex 25 and in axial alinement therewith is a cylindrical projection 61 positioned in a recess in the under face of the cover 62 secured to the annex 25.

.The gear 44 and small gear or pinion 45 revolve in a chamber 63 in the annex 25 this chamber being closed by the cover plate 64.

The worm 40 has a steep-pitched thread so that it may be rotated by the worm gear 39.

1t is believed that the operation and many advantages of the invention will be understood without further description.

Having thus described my invention, I claim- 1. In a device of the class described, a standard; a ram reciprocable therein; a nut in said ram; a rotatable screw in said nut; a shaft parallel with said screw; intermeshing gearing between said shaft and screw;

means for rotating said shaft toelevate the ram; a driving gear loosely mounted on said shaft; an over-running connection between said shaft and driving gear adapted to impart rotary movement to said driving gear only during the lowering of the ram; and frictionally controlled mechanism actuated by said driving gear for retarding the speed of said ram.

2. In a device of the class described, a standard; a ram reciprocable therein; a nut in said ram; a rotatable screw in said nut; a shaft parallel with ysaid screw; intermeshing gearing between said shaft and screw; means for rotating said shaft to elevate the ram; a driving gear loosely mounted on said shaft; an over-running connection between said shaft and driving gear adapted to impart rotary movement to said driving gear only during the lowering of the ram; a brake wheelrotata.v blelbyvsaid driving gear; brake arms nor mally contacting `therewith and preventing the rotation thereof; and means for separatmg the arms from said wheel.k

3. ln a device of the class described,s a standard; a ram recipr'ocable therein; a nut in said ram a rotatable screw in said nut; a shaft lparallele 'with saidscrew; intermesh? ing gearing between said shaft andscrew; means for rotatingsaidshaftto elevate the ram; a driving geai'y loosely mounted on said shaft; an over-running connection between said shaft and driving gear adapted to impart rotary movement to said driving gear only during the lowering of the ram; a brake wheel rotatable by said driving gear; a brake arm; a spring for forcing said arm into contact with the brake wheel; and means for separating said arm from said brake wheel.

4;. ln a device of the class described, a standard; a ram reciprocable therein; a nut in said ram; a rotatable screw in said nut; a shaft parallel with said screw; intermeshing gearing between said shaft and screw; means for rotating said shaft to elevate said shaft and screw; means for rotating said shaft to elevate the ram; a driving gear loosely mounted on said shaft; an overrunning connection between said shaft and driving gear adapted to impart rotary movement to said driving gear only during the lowering of the ram; a brake` wheel rotatable by said driving gear; a brake arm; a spring for forcing said arm into contact with the brake wheel; and a camfor sepa ating said arm from said brake wheel.

5. In a device of the class described a standard; a ram reciprocable therein; a nut in said arm; a. rotatable screw in said nut; a. shaft parallel with said screw; intermeshing gearingbetween said shaft and screw; me ns for rotating said shaft to elevate the ram; a driving gear loosely mounted on said shaft; an overrunning connection between said shaft and driving gear adapted to impart rotary movement to said driving gear only during the lowering of the ram; a brake wheel rotatable by said driving gear; a brake arm; a spring for forcing said arm into contact with the brake wheel; :i cani for separating said arm from said brake wheel; and a manuallyk actuated arm to move said cam about its axis.

k6. ln al device of the class described, a standard; a ram reciprocable therein; a nut in said ram a rotatable screw in said nut; a shaft parallel with said screw; intermeshing gearing between said shaft and screw; means for rotating said shaft to elevate the rain; a driving gear loosely mounted on said shaft; an over-running connection between said shaft and driving gear adapted to impart rotary movement to said drivingl gearnnly during the ylowering of the ram; a bralrey wheel; larms reacting therewith to normallyprevent rotation thereof; means i forseparating said arms from contact with vsaid wheel; and gearing between said dr1v for separating said arms from contact with said' wheel; a worm wheel rotatable by said driving gear; a steep-pitched worm rotated by said worm gear; and a train of gears` between said worm and brake wheel.

8. ln a device of the yclass described, a standard; ram reciprocable therein; a nut in said ram; a rotatable screw in said nut; a shaft parallel with said screw; intermeshf ing gearing between said shaft and screw; means for rotating said shaft to elevate the ram; a driving gear loosely mounted on said shaft; an over-running connection between said shaft and driving gear adapted to impart rotary movement to said driving gear only during the lowering of the ram; a brake wheel; arms coacting therewith to normally prevent rotation thereof; means for separating said arms from contact with said wheel; a worm wheel rotatable by said driving gear; a steep-pitched worm rotated by said worm gear; a large gear secured to rand revoluble with the worm shaft; a gear secured to and revoluble with the brake wheel; and two small gears rotatable together f and meshing respectively with the large gear and the brake wheel gear.

9. In a device of the class described, a standard; a ramy reciprocable therein; a nut in said ram; a rotatable screw in said nut; a shaft parallel with said screw; intermeshing gearing between said shaft and screw;

means for rotating said shaft to elevate the ram; a driving gear loosely mountedon said shaft; an over-running connection between sait. shaft and driving gear adapted to impart rotary movement to said driving gear f iso gearing actuated by the rotation of said worin sliat't to rotate said brake Wheel.

l0. ln a device of the class described, a standard; a ram reciprocable relatively thereto; means for elevating said ram; a

sha-tt 'parallel with said ram; intermeshing gearing between said shaft and elevating ieans; means tor positively rotating said sliait't in one direction to actuate said elevating means; a driving gear loosely mounted on said shaft; an over-running connection between said shaft and driving gear Boston, lvflass., this 25th day of October, 1921.

FRANK L. GORMLEY. Witnesses:

WALTER E. LOMBARD, NATHAN C. LOMBARD, 

